Fan



FIG. 1 is a front perspective view of a fan showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof (the left side being a mirror image); and,

FIG. 5 is a back elevation view thereof.

The broken lines shown in FIGS. 1-5 are for illustrative purposes only and form no part of the claimed design. The bottom of the fan forms no part of the claimed design. 

The ornamental design for a fan, as shown and described. 